| Description | Date | Identifier | |
| Arranging the examination and testing of a sleeveless magneto produced by Messrs. Norths for the 40/50 HP engine. | 11th Mar 1926 | Box 40 \ 2 Scan158 | |
| Letter from an accumulator manufacturer regarding Mr. Royce's feedback on a car's performance, battery, and other components. | 29th Nov 1926 | Box 40 \ 2 Scan159 | |
| Table detailing the force required to move the cam lever on various magnetos. | 13th Dec 1926 | Box 40 \ 2 Scan160 | |
| Magneto specifications and supplier issues, comparing Watford and Lucas products for 40/50 and 20HP models. | 27th Jan 1927 | Box 40 \ 2 Scan161 | |
| With sketches discussing ignition component design, comparing different manufacturers and materials. | 28th Jan 1927 | Box 40 \ 2 Scan162 | |
| Sending two Lucas magnetos for trial as an alternative to the standard Watford magnetos for the Phantom chassis. | 31th Jan 1927 | Box 40 \ 2 Scan163 | |
| The lifespan of magneto platinum contact points from suppliers Watford and Lucas. | 11th Feb 1927 | Box 40 \ 2 Scan164 | |
| Comparing the lifespan and performance of different types of magneto and battery ignition contact points. | 16th Feb 1927 | Box 40 \ 2 Scan165 | |
| Inquiring about performance observations of two Lucas magnetos on a chassis. | 9th Mar 1927 | Box 40 \ 2 Scan166 | |
| Request from the Lucas Company to borrow an ERS magneto. | 10th Mar 1927 | Box 40 \ 2 Scan167 | |
| Reply concerning the testing of Lucas Magnetos X8795. | 10th Mar 1927 | Box 40 \ 2 Scan168 | |
| Authorizing the loan of an ER6 magneto to Joseph Lucas Ltd. | 10th Mar 1927 | Box 40 \ 2 Scan169 | |
| Letter to Joseph Lucas Ltd. regarding the return of a Magneto. | 12th Mar 1927 | Box 40 \ 2 Scan170 | |
| Test report on a Lucas Magneto detailing its performance, silence and interchangeability issues with a Watford Magneto. | 22th Mar 1927 | Box 40 \ 2 Scan171 | |
| Confidential memo discussing issues and costs related to Lucas and Watford magnetos. | 1st Apr 1927 | Box 40 \ 2 Scan172 | |
| Confidential letter from Joseph Lucas Limited concerning magneto returns under guarantee. | 29th Mar 1927 | Box 40 \ 2 Scan173 | |
| Letter from Joseph Lucas Ltd regarding product reliability, contact breaker points, and distributor brush issues. | 29th Mar 1927 | Box 40 \ 2 Scan174 | |
| Copy of a letter from Joseph Lucas Ltd offering to supply further details on a matter. | 29th Mar 1927 | Box 40 \ 2 Scan175 | |
| Letter to The Lucas Elec. Co. Ltd. requesting the return of a borrowed type ER6 magneto. | 6th Apr 1927 | Box 40 \ 2 Scan176 | |
| Letter from Joseph Lucas Limited confirming a telephone conversation and arranging to send a sample E.R.6 magneto. | 8th Apr 1927 | Box 40 \ 2 Scan177 | |
| Poor reputation of the Lucas magneto and advising against its adoption until its reliability is proven on other vehicles. | 12th Apr 1927 | Box 40 \ 2 Scan178 | |
| Superior performance of Lucas magneto contact points and proposing an experiment to test them. | 25th Apr 1927 | Box 40 \ 2 Scan179 | |
| Letter to Lucas Electrical Co. Ltd. about a returned ERS magneto and a request for clarification on its replacement. | 25th Apr 1927 | Box 40 \ 2 Scan180 | |
| Return and replacement of a Lucas type ERS Magneto. | 27th Apr 1927 | Box 40 \ 2 Scan181 | |
| Letter from Joseph Lucas Limited regarding the return and modification of an E.R.6. Magneto. | 2nd May 1927 | Box 40 \ 2 Scan182 | |
| Forwarding a copy of a letter from Joseph Lucas Ltd. concerning their contact points. | 2nd May 1927 | Box 40 \ 2 Scan183 | |
| Letter from Joseph Lucas Ltd. responding to a request for special contact breaker points and offering to investigate the entire ignition system. | 30th Apr 1927 | Box 40 \ 2 Scan184 | |
| Letter to Joseph Lucas Ltd. regarding an experiment to fit their contact breaker points to a battery ignition system. | 26th Apr 1927 | Box 40 \ 2 Scan185 | |
| From EFC to Wd. discussing a proposal to experimentally test Lucas contact points on their ignition apparatus. | 3rd May 1927 | Box 40 \ 2 Scan186 | |
| The supply of ignition sets to Messrs. Lucas for their contact points. | 3rd May 1927 | Box 40 \ 2 Scan187 | |
| Decision not to pursue a matter with Joseph Lucas Ltd. | 4th May 1927 | Box 40 \ 2 Scan188 | |
| The performance and issues with a Lucas Magneto and other components on car 7-EX after 10,000 miles. | 11th May 1927 | Box 40 \ 2 Scan189 | |
| Inspecting a Bosch ignition coil and returning a Lucas magneto. | 17th May 1927 | Box 40 \ 2 Scan190 | |
| Modifications made to a Lucas EF6 Magneto and outlining future comparative tests. | 19th May 1927 | Box 40 \ 2 Scan191 | |
| Instruction sheet detailing modifications to the Lucas ER6 magneto No 53. | 19th May 1927 | Box 40 \ 2 Scan192 | |
| Instructions regarding modifications and comparative testing of Lucas and Watford magnetos. | 1st Jun 1927 | Box 40 \ 2 Scan193 | |
| Form recording the details and performance of a magneto test. | 1st Jun 1927 | Box 40 \ 2 Scan194 | |
| Specifications for primary point gap, contact breaker timing, and automatic advance characteristics. | 1st Jun 1927 | Box 40 \ 2 Scan195 | |
| Specification sheet detailing distributor dimensions in relative and absolute units, with a handwritten explanatory note. | 1st Jun 1927 | Box 40 \ 2 Scan196 | |
| Results of endurance and open circuit tests, including a volt-speed curve. | 1st Jun 1927 | Box 40 \ 2 Scan197 | |
| Test results for an electrical component, detailing ampere-speed curves and sparking characteristics. | 1st Jun 1927 | Box 40 \ 2 Scan198 | |
| Test report detailing secondary milliamps, primary point gap measurements, and contact breaker timing results. | 7th Oct 1938 | Box 40 \ 2 Scan199 | |
| Notes on operational silence and the tangential force required to advance a cam lever. | 7th Oct 1938 | Box 40 \ 2 Scan200 | |
| Requesting a comparative test of a sleeveless Watford magneto and a Lucas type ER6 magneto. | 10th Jun 1927 | Box 40 \ 2 Scan201 | |
| The inspection and testing of a new sleeveless Watford magneto and an up-to-date Lucas ER6 magneto. | 11th Jun 1927 | Box 40 \ 2 Scan202 | |
| Preliminary examination of a Lucas type ERS magneto, detailing modifications and specifications. | 13th Jun 1927 | Box 40 \ 2 Scan203 | |
| Comparison of specifications for Watford and Lucas magnetos, including ranges, timing, and distributor dimensions. | 13th Jun 1927 | Box 40 \ 2 Scan204 | |
| Comparison table of relative distributor dimensions for different ignition systems. | 13th Jun 1927 | Box 40 \ 2 Scan205 | |
| Endurance, short circuit, and open circuit tests performed on two magnetos. | 13th Jun 1927 | Box 40 \ 2 Scan206 | |
| Test report comparing the performance of two different machines, Lucas and Watford, including utility and speed tests. | 13th Jun 1927 | Box 40 \ 2 Scan207 | |
| Magneto performance, comparing the highest and lowest firing speeds of Watford and Lucas models under various test conditions. | 13th Jun 1927 | Box 40 \ 2 Scan208 | |
| Performance comparison between Watford and Lucas magnetos, detailing speeds, current draw, and noise levels. | 13th Jun 1927 | Box 40 \ 2 Scan209 | |
| Comparison report on the performance of Watford sleeveless type and Lucas type E.H6 magnetos. | 13th Jun 1927 | Box 40 \ 2 Scan210 | |
| Continued comparative analysis of Lucas and Watford magnetos regarding sparking figures. | 14th Jun 1937 | Box 40 \ 2 Scan211 | |
| Graph showing the open circuit volt-speed and short circuit ampere-speed curves for Watford and Lucas magnetos. | 14th Jun 1937 | Box 40 \ 2 Scan212 | |
| The dispatch of a Bosch ignition head and Lucas magneto, and requesting new models from Lucas and Watford. | 18th Jun 1927 | Box 40 \ 2 Scan213 | |
| The upgrading of two Lucas magnetos to match a third, ensuring interchangeability of distributors. | 24th Jun 1927 | Box 40 \ 2 Scan214 | |
| The testing results of a Lucas Magneto Type ER6, noting its performance and noise levels. | 27th Jun 1927 | Box 40 \ 2 Scan215 | |
| History of two Lucas magnetos. | 28th Jun 1927 | Box 40 \ 2 Scan216 | |
| History and performance report on Lucas ER6 Magnetos, models 51 and 54B. | 28th Jun 1927 | Box 40 \ 2 Scan217 | |
| The testing of a Lucas magneto 54B, detailing its performance and interchangeability with a Watford magneto. | 22th Mar 1927 | Box 40 \ 2 Scan218 | |
| Availability of the latest Lucas and new sleeveless Watford magnetos. | 29th Jun 1927 | Box 40 \ 2 Scan219 | |
| Instruction to replace the standard Watford magneto with an up-to-date Lucas magneto on chassis 9-EX. | 16th Jul 1927 | Box 40 \ 2 Scan220 | |
| Cured possibility of armature failures in magnetos and their low reject rate. | 13th Jul 1927 | Box 40 \ 2 Scan221 | |
| Swapping of a Lucas magneto with a Watford magneto between cars 9-EX and 10-EX due to noise levels. | 9th Aug 1927 | Box 40 \ 2 Scan222 | |
| Inquiring about the status of two Lucas magnetos returned for upgrading. | 23th Aug 1927 | Box 40 \ 2 Scan223 | |
| Testing of a new sleeveless magneto and swapping existing magnetos between chassis to resolve a noise issue. | 23th Aug 1927 | Box 40 \ 2 Scan224 | |
| Refusal to use Lucas magnetos due to their poor reputation and a comparison with other suppliers. | 27th Aug 1927 | Box 40 \ 2 Scan225 | |
| Damaged Lucas magneto distributor and a proposal for a safer screw-on design. | 13th Sep 1927 | Box 40 \ 2 Scan226 | |
| Letter from Joseph Lucas Ltd regarding a delay in modifying two magnetos due to difficulties meeting performance specifications. | 12th Oct 1927 | Box 40 \ 2 Scan227 | |
| Letter to Messrs. Lucas Ltd. concerning experiments on ERS magnetos and a reduction in their utility value. | 13th Oct 1927 | Box 40 \ 2 Scan228 | |
| Letter from Joseph Lucas Limited regarding experiments and the despatch of two ER6 magnetos. | 14th Oct 1927 | Box 40 \ 2 Scan229 | |
| Letter to The Lucas Elect. Co. Ltd. regarding a revised specification of performance for a 6-cylinder magneto. | 27th Oct 1927 | Box 40 \ 2 Scan230 | |
| The delayed receipt of two Lucas magnetos sent for an update. | 13th Dec 1927 | Box 40 \ 2 Scan231 | |
| Letter from Joseph Lucas Ltd regarding test results for type ER6 magnetos. | 5th Jan 1928 | Box 40 \ 2 Scan232 | |
| Test specification and performance data for Lucas ER6 magnetos. | 5th Jan 1928 | Box 40 \ 2 Scan233 | |
| The examination and testing of Lucas Type ER6 chassis magnetos. | 24th Jan 1928 | Box 40 \ 2 Scan234 | |
| Test report on a Lucas ER6 magneto after a 14,000-mile run, comparing low-speed sparking performance. | 21th Jan 1928 | Box 40 \ 2 Scan235 | |
| Instruction sheet detailing the examination of a magneto's electrical and mechanical condition. | 8th Dec 1924 | Box 40 \ 2 Scan236 | |
| Instructions regarding the cleaning of one magneto and the comparative testing of a Watford EW6 magneto. | 8th Dec 1924 | Box 40 \ 2 Scan237 | |
| Sending a Lucas magneto with a jump spark distributor for testing. | 11th Feb 1928 | Box 40 \ 2 Scan238 | |
| The investigation into the noisiness of Watford EW6 magnetos using modified cams. | 11th Feb 1928 | Box 40 \ 2 Scan239 | |
| The testing of magnetos, focusing on noise issues and their causes. | 13th Dec 1927 | Box 40 \ 2 Scan240 | |
| Noise testing of various magnetos and a modified contact breaker lever. | 11th Feb 1928 | Box 40 \ 2 Scan241 | |
| Magneto noise and operating force issues, suggesting design modifications and referencing various suppliers and models. | 11th Feb 1928 | Box 40 \ 2 Scan242 | |
| The design and performance variations of six magnetos, focusing on distributor rotor location and internal timing. | 11th Feb 1928 | Box 40 \ 2 Scan243 | |
| The performance and durability testing of Lucas magnetos, comparing tungsten and platinum contact points. | 24th Jan 1928 | Box 40 \ 2 Scan244 | |
| Test report on a Lucas Magneto ER.6 type B54B which developed a knock and was returned. | 15th Feb 1928 | Box 40 \ 2 Scan245 | |
| Exchanging a noisy Watford magneto for a Lucas magneto between experimental vehicles. | 6th Mar 1928 | Box 40 \ 2 Scan246 | |
| The investigation of a knocking noise in a modernised Lucas ER6 magneto. | 30th Mar 1928 | Box 40 \ 2 Scan247 | |
| Noisy magneto caused by a slightly warped bakelite gear wheel. | 9th Dec 1924 | Box 40 \ 2 Scan248 | |
| The unsatisfactory performance of Watford EW.6 magnetos, particularly regarding noisiness and poor low-speed electrical output. | 11th Apr 1928 | Box 40 \ 2 Scan249 | |
| Magneto performance issues, including cold start failures and noise, leading to specification changes and further testing. | 11th Apr 1928 | Box 40 \ 2 Scan250 | |
| Endurance tests and noise issues with magnetos, mentioning specific part numbers and modifications. | 11th Apr 1928 | Box 40 \ 2 Scan251 | |
| Endurance tests of magneto components, including tungsten points and bakelite gears. | 11th Apr 1928 | Box 40 \ 2 Scan252 | |
| Suggestion to obtain Lucas machines for production testing rather than experimental testing. | 16th Apr 1928 | Box 40 \ 2 Scan253 | |
| Selection of magnetos, comparing Watford, Lucas, and German Bosch models. | 16th Apr 1928 | Box 40 \ 2 Scan254 | |
| Extract from a letter regarding the performance of a Lucas magneto after 22,000 miles. | 15th May 1928 | Box 40 \ 2 Scan255 | |
| Examination and test report for a Lucas EFS Magneto No.55 from a Phantom chassis. | 12th Jun 1928 | Box 40 \ 2 Scan256 | |
| The examination, testing, and return of a Lucas magneto from a customer's car. | 13th Jun 1928 | Box 40 \ 2 Scan257 | |
| | | | |